Alert archive / Minnesota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 83, NWS Twin Cities, MN

August 18, 20094 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 18, 2009, 11:39 PM CDT for 4 counties in Minnesota. It was in force for 36 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 18, 2009, 11:39 PM CDT (04:39 UTC)
Expired: Aug 19, 2009, 12:15 AM CDT
In force: 36 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

Counties Chippewa County, MN, Lac qui Parle County, MN, Stevens County, MN, Swift County, MN

The radar

The Aberdeen radar (KABR), 181 km from the middle of the area, began a volume at 04:42 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Aug 18, 11:45 PM CDT	HAIL 1	Louisburg, MN	HAIL COVERED THE GROUND WITH LARGEST STONES BETWEEN DIME AND QUARTER SIZE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.7 hours before the alert went out and 182 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 5 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 2192 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KMPX 190439
SVRMPX
MNC023-073-149-151-190515-
/O.NEW.KMPX.SV.W.0083.090819T0439Z-090819T0515Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1139 PM CDT TUE AUG 18 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTH CENTRAL STEVENS COUNTY IN WEST CENTRAL MINNESOTA...
  WESTERN SWIFT COUNTY IN WEST CENTRAL MINNESOTA...
  NORTH CENTRAL LAC QUI PARLE COUNTY IN WEST CENTRAL MINNESOTA...
  NORTHWESTERN CHIPPEWA COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 1215 AM CDT

* AT 1138 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
  THIS STORM WAS LOCATED NEAR LOUISBURG...OR ABOUT 8 MILES NORTH OF
  MADISON...AND MOVING NORTHEAST AT 10 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  LOUISBURG...
  APPLETON...
  MILAN...
  HOLLOWAY...
  BIG BEND CITY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS AND LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4524 9626 4520 9612 4531 9613 4542 9594
      4512 9571 4501 9624 4517 9636
TIME...MOT...LOC 0439Z 242DEG 8KT 4514 9618

$$

1 follow-up statement

000 
WWUS53 KMPX 190504
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1204 AM CDT WED AUG 19 2009

MNC023-073-149-151-190515-
/O.CON.KMPX.SV.W.0083.000000T0000Z-090819T0515Z/
STEVENS MN-SWIFT MN-LAC QUI PARLE MN-CHIPPEWA MN-
1204 AM CDT WED AUG 19 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR NORTHWESTERN CHIPPEWA...EAST CENTRAL LAC QUI PARLE...WESTERN
SWIFT  AND EXTREME SOUTH CENTRAL STEVENS COUNTIES IN WEST CENTRAL
MINNESOTA...

AT 1150 PM CDT...NICKEL SIZE HAIL WAS REPORTED 7 MILES SOUTHWEST OF 
APPLETON.

AT 1159 PM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM...
CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
OF 60 MPH. THE SEVERE STORM WAS LOCATED 4 MILES SOUTHEAST OF
APPLETON...AND MOVING NORTHEAST AT 15 MPH.

LOCATIONS IN THE WARNING INCLUDE...
HOLLOWAY AND BIG BEND CITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS AND LARGE HAIL. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

REPORT ANY DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY...FOR RELAY
TO THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 4507 9595 4513 9603 4515 9605 4519 9611
      4531 9613 4542 9594 4512 9571
TIME...MOT...LOC 0503Z 226DEG 13KT 4516 9597

$$

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 19, 12:20 AM CDT	Special Weather Statement	MPX	Swift	40 min
Aug 19, 12:41 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Swift	34 min
Aug 19, 12:59 AM CDT	Special Weather Statement	MPX	Swift	46 min
Aug 19, 1:18 AM CDT	Special Weather Statement	MPX	Kandiyohi	42 min
Aug 19, 2:16 AM CDT	Areal Flood Advisory	MPX	Chippewa, Kandiyohi, Lac qui Parle, Meeker, Swift	5 hr
Aug 19, 1:04 PM CDT	Areal Flood Advisory	MPX	Anoka, Carver, Chisago, Hennepin, Isanti, Kanabec and 7 more	6 hr
Aug 19, 2:11 PM CDT	Tornado Warning	MPX	Anoka, Hennepin, Ramsey	34 min
Aug 19, 2:16 PM CDT	Tornado Warning	MPX	Dakota	29 min
Aug 19, 2:53 PM CDT	Tornado Warning	MPX	Dakota, Ramsey, Washington	22 min
Aug 19, 3:16 PM CDT	Tornado Warning	MPX	Anoka, Ramsey, Washington	29 min
Aug 19, 3:46 PM CDT	Tornado Warning	MPX	Anoka, Chisago, Washington	29 min
Aug 19, 4:21 PM CDT	Tornado Warning	MPX	Chisago	39 min
Aug 19, 4:49 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Yellow Medicine	41 min
Aug 19, 5:18 PM CDT	Severe Thunderstorm Warning	MPX	Redwood	21 min
Aug 19, 5:24 PM CDT	Special Weather Statement	MPX	Chippewa, Swift	51 min
Aug 19, 6:02 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood	58 min
Aug 19, 6:19 PM CDT	Tornado Warning	MPX	Brown	26 min
Aug 19, 6:29 PM CDT	Tornado Warning	MPX	Brown	31 min
Aug 19, 6:39 PM CDT	Tornado Warning	MPX	Brown	36 min
Aug 19, 6:44 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Renville	44 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2009 Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.